Friction device.



P-ATENTED JUNE 11, 1907.

V. G. APPLE. FRICTION DEVICE. APPLICATION FILED APR. s, 1907.

Witnesses. 606W UNITED STATES PATENT OFFICE VINCENT G. APPLE, OF DAYTON, OHIO, ASSIGNOR To NATIONAL BRAKE AND CLUTCH COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION.

FRICTION DEVICE.

' Specification of Letters Patent.

Patented June 11, 1907.

Application filed April 3, 1907; serial No. 366,167.

citizen of the United States, residing in Dayton, in the county of Montgomery and. State duced at a minimum expense.

'bodying this invention.

of Ohio, havejnvented an Improvement in Friction Devices, of which the following de scription, in connection with the accompanying drawings, is a specification, like letters on the drawings representing like parts.

This invention relates to a friction device employing cork as the friction surface and is herein shown as embodied in a pulley, and has for its object to provide a device of the character specified, which is of increased efficiency and durability and which may be pro- F or this pur pose the driving surface of the pulley is composed of compressed corklocated between washers or reinforcing members of substantially flexible, non-metallic material, preferably leather, which are engaged by end disks or plates of rigid material, preferablymetal, firmly secured together as by rivets extended through the interposed compressed cork.

The cork portion of the pulley is preferably made of a plurality of layers or sections,

which are arranged side by side between the reinforcing members orwashers of leather, and'the' latter are made of substantially the same size as that of the cork sections, so that when the cork sections are subjected to compression between the metal side or end plates, they are substantially uniformly compressed for substantially their full diameter, thereby obtaining a firm and durable wearing surface for the pulley and avoiding waste of cork, as willbe described.

These and other features of this invention will be pointed out in the claims at the end of this specification.

' Figure 1 is an elevation of a pulley cm- Fig. 2, a side elevation looking toward the right in Fig. 1. Fig. 3, a section on the line 33, Fig. 2, and Fig. 4, a sectional view to illustrate the advantages of the present invention.

side or end layers or sections of cork.

forcing layers or washers d of flexible material, preferably sole leather, which are interposed between said metal disks and the crit- T 1e metal plates or disks b, 0 may be secured together by rivets e or in any other suitable manner.

I may prefer to provide the pulley with one or metal disks f interposed between adjacent cork-disks, which serves to preventthe rivets buckling and also serves to strengthen the pulley.

In the manufacture of the pulley herein shown, the parts except the rivets are assembled together, and subjected to considerable pressure so as to highly compress the cork layers or disks a and thereby impart to the pulley a compact, tenacious and durable periphery of cork, with which an increased friction may' be obtained, which renders the pulley especially adapted for driving purposes.

The cork sections in their natural state and before compression are materially wider than in the finished pulley, and in practice I prefer to compress them to about one fourth of their original width.

In order to effect a material saving in cork and obtain a superior pulley'having a wearing surface of increased depth, the outside or endmost layers or disks of cork are engaged by the layers or washers d of leather or other like fibrous or non-metallic material, which project beyond the circumferential edge of the metal disks or plates b, 'c, and serve to transmit the compressing action of the rigid disks b, c to substantially the circumference of the cork sections, so that the latter are compressed in a substantially uniform manner throughout their full diameter, while at Fig. 4, wherein it will be seen that the cir cumferential -'portion of the outside .cork 'la'yers "overlapor. project beyond the metal disks or plates asat-h which require subsequent t off of a material quantity of cork, and that the circumferential portions of the intermediate cork layers are com-' I pressed'to a less degree than their central portions, thereby leaving-the periphery of the pulleysofter than the compressed central portion and less durable. So also the edges of the outside cork layers are unsupported and liable to be' broken or chipped ofi in use, itherebydiminishing the efiiciency 7 and of the pulley. These objectionable features are avoided in accordance with the present invention by the supporting ends .cflthe-non-inetallic washers d.

' I-{have herein described the friction device "as a .cone pulley, but I do notdesire-to limit my mv'ention in this respect, asother forms .of'friction devices, such as circular pulleys,

brakes, clutches, etc..ma be made afterthe 'manner herein shown; 0 also I may prefer to makefthe supporting washers or pieces d of leather, such as sole leather, but I do not desire tolimit my invention in this respect, as other material" which will Wear 1 sub-.

I stal i'tiallyruni formly'with the;cork and -possess sufiicientfirmness to compress the. edges of the cork a J sectionsmay b'eused.

- Claims.

1. As an improved article of manufacture,-. a composite pulley having metallic side. .pieces, an intermediate portion of com-- pressed cork projecting beyond-theedge-of -the metallic. side pieces, and non-metallic pieces interposed between the metallic side 1 pieces and the cork and extended beyondstates aid metallic- 'side..pieces, and :means to secure said metallic pieces together, substantiallyas described. 2. As an improved article of..manufacture, a composite pulley "having side pieces of rigid material, and a rigid piece intermediate sa1d side pieces, a compressed cork portion between said rigid piece and said sidepieces and 'prO ectmg beyond the latter, non-me- I pieces of rigid material,.a compressed-cork ortion between said vside pieces :andwpro ecting beyond the same,.. and non-rmetallic supporting. ieces for'thei rojecting: ortions of said cor interposed and said side pieces.

1. As an improved article of manufacture,

.a composite friction device ;.havi-ngeiide :pieces of -rigid material, a compressed :cork portion betweensaid sidev pieces andpro3'ect- .ing beyond the-same,iand ;piece's tofifirm [leather interposed between said (cork portionand said side pieces SIIdfPIOjGGtiDgibB- yond sa1d side pieces to re iniorceor-sup- ;p'ort -the-projecting cork portion, substantially: as described.

Intestimony whereof, .I :have signed :my

1 name :to this specificationin the presence of .two subscribing witnesses.

' VINCENT *GQAPBLIE. I

I Witnesses: I 1 Brass IE :B.'AP1 LE,

I. WARNER.

etween it e same 

